The metal that does not displace hydrogen from an acid is:

1. Hg

2. Zn

3. Al

4. Ca

The catalyst used in Bosch process of manufacture of H₂ is:

1. finely divided Ni

2. V₂O₅

3. Pd

4. Fe₂O₃ + Cr₂O₃

An aqueous solution of hydrogen peroxide is:

1. alkaline

2. neutral

3. strongly acidic

4. weakly acidic

The correct statement among the following regarding perhydrol is -

1. It is 30% H₂O₂ or 100 vol. H₂O₂

2. Its molarity is 8.8 M

3. It is used as an antiseptic and a germicide

4. All of the above

The ortho and para hydrogen possess:

1. same physical properties but different chemical properties

2. different physical properties but same chemical properties

3. same chemical and physical properties

4. different physical and chemical properties

On bubbling CO₂ through a solution of barium peroxide in water:

1. O₂ is formed

2. H₂CO₃ is formed

3. H₂O₂ is formed

4. H₂ is formed

A mixture of hydrazine and 60 to 90 percent of H₂O₂ solution is:

1. antiseptic

2. rocket fuel

3. germicide

4. insecticide

Temporary hardness is caused due to the presence of:

1. CaSO₄

2. CaCl₂

3. CaCO₃

4. Ca(HCO₃)₂

H₂O₂ is prepared in the laboratory by the reaction of :

1. MnO₂ with dilute cold H₂SO₄

2. BaO₂ and  CO₂ bubbling through cold water

3. PbO₂ with an acidified solution of KMnO₄

4. Na₂O₂ with boiling water

A 1000 g aqueous solution of CaCO₃ contains 10 g of calcium carbonate. The hardness of the solution is:

1. 10 ppm

2. 100 pm

3. 1000 ppm

4. 10000 ppm